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Cannot load xerces SAXParser

 
Jeppe Sommer
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posted 13 years ago
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Hello,

I have some serious problems with Xerces2 Java Parser 2.9.1.

I am using Apache Tomcat/5.5.25 JVM 1.5.0_16-b02.

I just downloaded Xerces2 version 2.9.1. I copied the following jar files into the library called: /apache-tomcat-5.5.25/shared/lib/ :

resolver.jar
serializer.jar
xercesImpl.jar
aml-apis.jar

When I restart the container it seems to work fine. But it only works until I reload my application using Tomcat Web Application Manager. Then I get this error:
java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser

I have searched the internet to solve the problem. It seems that several people have experienced the same problem, but I´m not sure how to work around this issue.

Any help please would be appreciated?

Log print from wrapper.log:

 
Jelle Klap
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posted 13 years ago
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Why are you explicitly using Xerces version 2.9.1 as a shared library? The JAXP 1.3 implementation included the Java release you're using already uses the Xerces parser (albeit version 2.6.2) by default.
From the log file I see you're using the JDOM API. Itss SAXBuilder class will, by default, use JAXP to retrieve a parser. So based on just this information I don't really see the need to include the shared library.
Shared libraries are something to be very cautious about anyway, but especially in case of an XML parser implementation.

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Jeppe Sommer
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posted 13 years ago
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Thanks, it works now :-)

I removed the file called xercesImpl.jar. Then I added a previous installed jar file called xerces.jar and it works now.


Jelle Klap wrote:Why are you explicitly using Xerces version 2.9.1 as a shared library? The JAXP 1.3 implementation included the Java release you're using already uses the Xerces parser (albeit version 2.6.2) by default.
From the log file I see you're using the JDOM API. Itss SAXBuilder class will, by default, use JAXP to retrieve a parser. So based on just this information I don't really see the need to include the shared library.
Shared libraries are something to be very cautious about anyway, but especially in case of an XML parser implementation.

 
Jeppe Sommer
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posted 13 years ago
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Hello,

I just realized, that I still have a problem with my code.

As mentioned in my previous message I tried to remove all the jar files from Xerces version 2.9.1 package. I removed the following files from tomcat/shared/lib and restarted the container:

xercesImpl.jar.
xml-apis.jar
serializer.jar
resolver.jar

I also removed xerces.jar from tomcat/shared/lib

Without xerces.jar (after restarting the container) and got the following an error:

I then added the xerces.jar again and it works until I restart the application with Tomcat web application manager. Now I get the following errors:


It seems to be a org.jdom.JDOMException:
- Could not load org.apache.xerces.parsers.SAXParser: SAX2 driver class org.apache.xerces.parsers.SAXParser not found...

I'm not sure how to work around this issue? As I understood on the last reply, I was told to remove the Xerces package,
because the JDOM API by default is using the JAXP to retrieve a parser. I removed the Xerces version 2.9.1 package,
but is still getting a org.jdom.JDOMException?

Here is some of the other jar files placed in the tomcat/shared/lib:

xml-apis.jar
xerces.jar
xalan.jar
saxpath.jar
jdom.jar
jaxrpc.xml
jaxen-jdom.jar
jaxen-core.jar
 
Jelle Klap
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posted 13 years ago
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You don't need any of those dependency libraries I think.
JAXP 1.3 includes a SAX 2.0.2 parser, which JDOM requires (the Xerces dependency), but it also supports XPath and XSLT (the Jaxen and Xalan dependency JARs).
I'm prretty sure you can clear the shared/lib folder completely of JDOM dependencies. Also, I'd suggest moving the jdom.jar file itself to the WEB-INF/lib folder of the specific web application(s) that require(s) it, instead of making it a shared library.

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isuru chamarasinghe
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posted 12 years ago
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I faced with the same issue when trying to pass an XML file using org.apache.xerces.parsers.SAXParser.

After goggling for a while came with the below solution.

I downloaded the latest release of Xerces-J-bin.X.XX.X.zip and copied the xercesImpl.jar to the ext folder under jre6.

1. In my case I download Xerces-J-bin.2.11.0.zip from http://www.apache.org/dist/xerces/j/Xerces-J-bin.2.11.0.zip URL.

2. Unzipped and copy the xercesImpl.jar file to C:\Program Files\Java\jre6\lib\ext

Please note, this can be accomplished by adding the xercesImpl.jar into your class-path as a dependency as well.

Isuru Chamarasinghe.
BIT (C.Sturt), SCJP, SCWCD, SCBCD, A+, OCA

 
John McDonnell
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posted 12 years ago
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isuru chamarasinghe wrote:I faced with the same issue when trying to pass an XML file using org.apache.xerces.parsers.SAXParser.

After goggling for a while came with the below solution.

I downloaded the latest release of Xerces-J-bin.X.XX.X.zip and copied the xercesImpl.jar to the ext folder under jre6.

1. In my case I download Xerces-J-bin.2.11.0.zip from http://www.apache.org/dist/xerces/j/Xerces-J-bin.2.11.0.zip URL.

2. Unzipped and copy the xercesImpl.jar file to C:\Program Files\Java\jre6\lib\ext

Please note, this can be accomplished by adding the xercesImpl.jar into your class-path as a dependency as well.



I've tried adding it to my class path and I was having no luck. I then spotted this post, and stuck the jar in the lib/ext folder and everything worked.

How do you mean "into your class-path as a dependency"

OCPJP - 68%

 
KiranPatel JavaKnowledge
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posted 10 years ago
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I was facing the same issue, It was solved only when I replaced xerces-1.4.jar file with a newer version xerces-2.6.2 jar
 
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